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Raj R.M.,Ranipettai Engineering College | Selvakumar R.,University of Madras | Bakthadoss M.,University of Madras | Murugavel S.,Vellore Institute of Technology
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

In the title compound, C 15H 13NO 2S, the benzothiazole unit is essentially planar [maximum deviation = -0.0099 (5) Å for the S atom] and is oriented at a dihedral angle of 4.8 (5)° with respect to the benzene ring. An intramolecular O - H⋯N hydrogen bond generates an S(6) ring motif. The crystal packing is stabilized by C - H⋯π interactions.


Kannan D.,University of Madras | Bakthadoss M.,University of Madras | Madhanraj R.,Ranipettai Engineering College | Murugavel S.,Vellore Institute of Technology
Acta Crystallographica Section E: Structure Reports Online | Year: 2012

In the title compound, C25H22N2O 3S, the sulfonyl-bound benzene ring forms dihedral angles of 36.8 (2) and 81.4 (2)°, respectively, with the formyl-benzene and methyl-benzene rings. The mol-ecular conformation is stabilized by an intra-molecular C-H⋯O hydrogen bond, which generates an S(5) ring motif. The crystal packing is stabilized by C-H⋯O hydrogen bonds, which generate C(11) chains along the b axis. The crystal packing is further stabilized by π-π inter-actions [centroid-centroid distance = 3.927 (2) Å].


Madhanraj R.,Ranipettai Engineering College | Murugavel S.,Vellore Institute of Technology | Kannan D.,University of Madras | Bakthadoss M.,University of Madras
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

In the title compound, C25H23NO5S, the sulfonyl-bound benzene ring forms dihedral angles of 37.2 (1) and 67.0 (1)°, respectively, with the formyl-phenyl and phenyl rings. The molecular conformation is stabilized by an intramolecular C-H⋯π inter-action. In the crystal, molecules are linked by C-H⋯O hydrogen bonds, forming a two-dimensional network in the (110) plane in which R44(38) ring motifs are generated.


Madhanraj R.,Ranipettai Engineering College | Vijayakumar S.,Sri Balaji Chokkalingam Engineering College | Selvakumar R.,University of Madras | Bakthadoss M.,University of Madras | Murugavel S.,Vellore Institute of Technology
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

In the title compound, C 11H 10BrClO 2, the dihedral angle between the benzene ring and the plane of the acrylate unit is 62.1 (1)°. The crystal packing is stabilzed by inter-molecular C-H⋯O hydrogen bonds and C-Cl⋯π interactions [Cl⋯centroid = 3.829 (1) Å and C-Cl⋯centroid = 165.3 (1)°].


Vijayakumar S.,Sri Balaji Chokkalingam Engineering College | Madhanraj R.,Ranipettai Engineering College | Murugavel S.,Vellore Institute of Technology | Selvakumar R.,University of Madras | Bakthadoss M.,University of Madras
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

In the title compound, C 19H 17BrO 4, the dihedral angle between the two benzene rings is 82.1 (1)°. The mol-ecular structure is stabilized by an intra-molecular C-H⋯O hydrogen bond which generates an S(7) ring motif. The crystal packing is stabilized by inter-molecular C-H⋯O hydrogen bonds and C-H⋯π interactions. Inter-molecular C-H⋯O interactions are involved in the formation of centrosymmetric R 2 2(16) dimers, which are connected into supra-molecular tapes running along the [100] direction.


Madhanraj R.,Ranipettai Engineering College | Murugavel S.,Vellore Institute of Technology | Kannan D.,University of Madras | Bakthadoss M.,University of Madras
Acta Crystallographica Section E: Structure Reports Online | Year: 2012

In the title compound, C 29H 25NO 5S, the sulfonyl-bound benzene ring forms dihedral angles of 42.1 (1) and 48.5 (1)°, respectively, with the formyl-substituted benzene ring and the naphthalene residue. In the crystal, pairs of C - H⋯O interactions lead to the formation of R 2 2(10) inversion dimers, which are linked by further C - H⋯O interactions into supra-molecular tapes running along [100]. The crystal packing is further stabilized by C - H⋯π inter-actions.


Madhanraj R.,Ranipettai Engineering College | Murugavel S.,Vellore Institute of Technology | Kannan D.,University of Madras | Bakthadoss M.,University of Madras
Acta Crystallographica Section E: Structure Reports Online | Year: 2012

In the title compound, C 24H 19ClN 2O 3S, the sulfonyl-bound benzene ring forms dihedral angles of 38.1(2) and 81.2(1)°, respectively, with the formyl benzene and benzene rings. The molecular conformation is stabilized by a weak intramolecular C-H···O hydrogen bond, which generates an S(5) ring motif. The crystal packing is stabilized by C-H···O hydrogen bonds, which generate C(7) zigzag chains along [010] and R 3 3(19) ring motifs along [010]. The crystal packing is further stabilized by C-Cl···π interactions [Cl·· ·centroid = 3.456(2) Å and C-Cl···centroid = 173.4(2)°].


Madhanraj R.,Ranipettai Engineering College | Murugavel S.,Vellore Institute of Technology | Kannan D.,University of Madras | Bakthadoss M.,University of Madras
Acta Crystallographica Section E: Structure Reports Online | Year: 2012

In the title compound, C 25H 25NO 5S, the O atom of the hydroxy group is disordered over two positions, with occupancies of 0.820 (2) and 0.180 (2). The sulfonylbound benzene ring forms dihedral angles of 31.8 (1) and 60.7 (1)°, respectively, with the hydroxymethylbenzene and phenyl rings. The molecular conformation is stabilized by an intramolecular O - H⋯O hydrogen bond, generating an S(8) ring motif. The crystal packing is stabilized by intermolecular C - H⋯O hydrogen bonds and C - H⋯π interactions.


Bakthadoss M.,University of Madras | Selvakumar R.,University of Madras | Madhanraj R.,Ranipettai Engineering College | Murugavel S.,Vellore Institute of Technology
Acta Crystallographica Section E: Structure Reports Online | Year: 2012

In the title compound, C11H11NO2, the mean planes formed by the benzene ring and the C and N atoms of the acryl group are almost orthogonal to each other, with a dihedral angle of 85.7 (1)°. During the structure analysis, it was observed that the unit cell contains large accessible voids, with a volume of 186.9 Å3, which may host disordered solvent mol-ecules. This affects the diffraction pattern, mostly at low scattering angles. Density identified in these solvent-accessible areas was calculated and corrected for using the SQUEEZE routine in PLATON [Spek (2009), Acta Cryst. D65, 148-155]. Despite the presence of the hy-droxy group in the mol-ecule, no classical or nonclassical hydrogen bonds are observed in the structure. This may reflect the fact that the O-H group points towards the solvent-accessible void.


Radhika H.,Ranipettai Engineering College | Bhuvaneswari P.T.V.,Anna University | Senthil Kumar P.,Ranipettai Engineering College
Proceedings of the 2010 International Conference on Signal and Image Processing, ICSIP 2010 | Year: 2010

In this paper, an accurate distance estimation for outdoor wireless sensor network is proposed. An experimental study on Radio Signal Strength (RSS) measurement has been carried out with Zigbee RF module series 1. A statistical modeling is performed to determine the best channel. From the RSS values of the best channel, the distance between the anchor & unknown node is computed using Longley-Rice and Nakagami Models. The accuracy of distance estimation is refined using onedimensional Kalman Filter. ©2010 IEEE.

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